Apparatus and method for sampling of confined spaces

• US 8,895,916 B2
• Filed: 05/16/2014
• Issued: 11/25/2014
• Est. Priority Date: 05/08/2009
• Status: Active Grant

• Current Assignee: Bruker Scientific LLC (Bruker Corporation)
• Original Assignee: IonSense, Inc. (Bruker Corporation)
• Inventors: Musselman, Brian D
• Primary Examiner(s): Souw, Bernard E
• Application Number:
  US14/279,644
• Publication Number:
  US 20140246578A1
• Time in Patent Office: 193 Days
• Field of Search: 250/281, 250/282, 250/288, 250/423.R, 250/423, 250/429, 250/442.11, 73/232, 73/232.2, 73/232.5, 73/233.7, 324/459, 324/464, 324/465, 422/244, 422/280, 422/906
• US Class Current: 250/281
• CPC Class Codes: G01N 1/2214 by sorption
• CPC Class Codes: G01N 1/2226 Sampling from a closed space, e.g. food package, head space
• CPC Class Codes: G01N 1/2273 Atmospheric sampling
• CPC Class Codes: G01N 2001/022 sampling for security purposes, e.g. contraband, warfare agents
• CPC Class Codes: G01N 27/62 by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
• CPC Class Codes: H01J 49/0027 Methods for using particle spectrometers
• CPC Class Codes: H01J 49/0409 Sample holders or containers containers for retaining a material to be analyzed, B01L3/50, for DNA, C12Q1/6834, for biological materials, G01N33/543
• CPC Class Codes: H01J 49/10 Ion sources; Ion guns

Abstract

In various embodiments of the invention, a cargo container can be monitored at appropriate time intervals to determine that no controlled substances have been shipped with the cargo in the container. The monitoring utilizes reactive species produced from an atmospheric analyzer to ionize analyte molecules present in the container which are then analyzed by an appropriate spectroscopy system. In an embodiment of the invention, a sorbent surface can be used to absorb, adsorb or condense analyte molecules within the container whereafter the sorbent surface can be interrogated with the reactive species to generate analyte species characteristic of the contents of the container.

Claims

1. A system for analyzing a cargo comprising:

a container, where the container can be substantially confined on all sides, where the container includes at least a distal end and a proximal end;

an atmospheric ionization sorbent module (AISM) including a sorbent surface, where the AISM is located one or both of inside the container and outside the container, where the AISM is adapted to be connected to one or both one or more sites inside the container and one or more sites outside the container;

a condenser located to cool the AISM sorbent surface to assist in absorption, adsorption and condensation on the sorbent surface;

an atmospheric ionizer generating and directing ionizing species at a region in front of the AISM sorbent surface, where the atmospheric ionizer generates ions from the AISM sorbent surface; and

a spectroscopy system which analyzes the ions formed by the atmospheric ionizer directed at the AISM sorbent surface.

2. The system of claim 1, where the condenser lowers temperature of the sorbent surface above ambient temperature by between:

a lower limit of approximately 1×

10¹ degrees Celsius; and

an upper limit of approximately 1×

10² degrees Celsius.

3. The system of claim 1, where one or more tubes located in the container connect the AISM to one or both the distal end and the proximal end.

4. The system of claim 3, further comprising a partition, where the partition separates the proximal end from the distal end, where the proximal end has a first atmosphere, where the distal end has a second atmosphere, where molecules in one or both the first atmosphere and the second atmosphere are transported through the one or more tubes to the AISM.

5. The system of claim 4, where one or more molecules travel through one or more tubes located in the container connecting one or both the distal end and the proximal end to the region in front of the sorbent surface and one or more of absorb, adsorb and condense on the AISM sorbent surface.

6. The container of claim 1, where the AISM is adapted to receive a gas ion separator connected to the spectroscopy system, where the gas ion separator transports the ions into the spectroscopy system.

7. The container of claim 1, further comprising a heater to assist in desorption of molecules condensed on the sorbent surface prior to ionization.

8. The container of claim 7, where the heater increases the sorbent surface temperature above ambient temperature by between:

a lower limit of approximately ten degrees Celsius; and

an upper limit of approximately one hundred degrees Celsius.

9. A method for analyzing a content of a container comprising the steps of:

receiving the container, where the container can be substantially confined on all sides, where the container includes at least a distal end and a proximal end;

locating an atmospheric ionization sorbent module (AISM) including a sorbent surface and a region in front of the sorbent surface, where the AISM is located one or both of within the container and outside the container, where the AISM is adapted to be connected to one or both one or more sites inside the container and one or more sites outside the container, where the AISM is adapted to receive an atmospheric ionizer directed at the region in front of the sorbent surface;

loading the container with a cargo;

transporting the cargo in the container to a destination;

cooling the AISM sorbent surface to absorb, adsorb and condense vapors within the container;

directing an ionizing species at a region in front of the AISM sorbent surface, where the ionizing species are formed by an atmospheric ionizer;

analyzing ions formed by the atmospheric ionizer directed at the AISM with a spectroscopy system connected to the atmospheric ionizer; and

analyzing the AISM one or both prior to and on arrival at the destination to determine the content of the container.

10. The method of claim 9, where the sorbent surface is exposed to atmosphere inside the container while the cargo is transported to the destination.

11. The method of claim 9, where cooling lowers the sorbent surface temperature below ambient temperature by between:

a lower limit of approximately ten degrees Celsius; and

an upper limit of approximately one hundred degrees Celsius.

12. The method of claim 9, further comprising desorbing molecules from the sorbent surface while the sorbent surface is bombarded with ionizing species.

13. The method of claim 12, where a heater desorbs molecules by raising the sorbent surface temperature above ambient temperature by between:

a lower limit of approximately ten degrees Celsius; and

an upper limit of approximately one hundred degrees Celsius.

14. The method of claim 9, where the spectroscopy system is selected from the group consisting of an ion mobility spectrometer, a mass spectrometer, an infrared spectrometer, a near-infrared spectrometer, a differential mobility spectrometer, a digital mass spectrometer and a chemical analyzer.

15. The method of claim 9, further comprising one or both blowing and sucking air from within the container onto the sorbent surface.

16. A chemical sample collector for use in a container comprising:

a housing having at least one opening, where the housing is located one or both of inside the container and outside the container, where the housing is connected to one or both one or more sites inside the container and one or more sites outside the container;

a sorbent material associated with a surface located in the housing; and

a condenser positioned to cool the sorbent material to assist in absorption, adsorption and condensation of chemical vapors in the container atmosphere onto the sorbent material.

17. The chemical sample collector of claim 16, where the condenser decreases the sorbent material temperature below ambient temperature by between:

a lower limit of approximately 1×

10¹ Celsius; and

an upper limit of approximately 1×

10² Celsius.

18. The chemical sample collector of claim 16, where the sorbent material is further adapted to connect with compartments within the container via one or more tubes located in the container.

19. The chemical sample collector of claim 16, further comprising a gas ion separator to transport ambient air to the sorbent material.

20. The chemical sample collector of claim 16, further comprising one or both a fan and a vacuum for blowing and sucking ambient air within the container onto the sorbent material.